Hex socket head cap screw(HSK(Hikari Seiko(Coarse Stainless steel Unplated 8 X 75 Pitch 1.25

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This is a bolt with a hexagonal socket in a cylindrical head.
A hex key (Allen wrench) is used for tightening. Although classified as a bolt, it is in most cases used without a nut.
It is also known as a cap screw or socket screw.
Open-end spanners and wrenches used to tighten hex bolts require working clearance around the fastener, whereas a hex key requires no such clearance.
For this reason, the use of hex socket head cap screws enables work in confined spaces and contributes to the miniaturization of machinery.
Their appearance has also led to an increasing use in decorative applications.

• Hex socket head cap screw HSK Hikari Seiko Coarse pitch
• Nominal diameter (d) M8
• Length under head (ℓ) 75.0
• Pitch (P) 1.25
• Thread length (b) Reference 28
• Head outer diameter (dk) 13
• Head height (k) 8
• Hex socket width across flats (s) 6
• Hex socket depth (t) 4 or more
• Full thread range 35